Move "AmbientCapabilities=CAP_NET_BIND_SERVICE" to the "[Service]"
section of the optional "lowport" unit drop-in file and package that
drop-in in a separate, optionally installable jellyfin-server-lowports
subpackage.
This isolates the CAP_NET_BIND_SERVICE capability to only installations
that desire it.
Signed-off-by: Brian J. Murrell <brian@interlinx.bc.ca>
